It studied a pool of 4 million used cars that were one to three years old and had been sold from January to July.

iSeeCars.com found that the slowest-selling used car on the market was the PorscheCayenne, with the Porsche 911 not too far behind in the No. 4 spot.

“Cars that remain on market for longer than average indicate that supply is higher than demand, which could mean the pricing is too high or that the car isn’t as well-liked as its competitors,” iSeeCars CEO Phong Ly said in a statement.

The study sampled a pool of 4 million used cars that were one to three years old and had been sold from January to July.

iSeeCars.com found that the slowest-selling used car on the market was the Porsche Cayenne, with the Porsche 911 not too far behind in the No. 4 spot.

“A late-model used Cayenne is one of the most expensive used SUVs on the market with a price of $US61,136, and a used 911 is the most expensive vehicle among those we analysed at $US122,124,” iSeeCars CEO Phong Ly said in a statement. “These are very high price points for used car shoppers, which could explain why dealers struggle to move them off the lot.”

iSeeCars.com also found that the average late-model used car took 46.4 days to sell on average. Data showed the 10 slowest selling used cars remained on the market 32.9% to 44.8% longer than average.

“Cars that remain on market for longer than average indicate that supply is higher than demand, which could mean the pricing is too high or that the car isn’t as well-liked as its competitors,” Ly said.

Let’s take a look below at the slowest-selling used cars on the market based on iSeeCars’ research data.